Remove curseforge service (#763)

* Remove curseforge service

The curseforge api behind the curseforge service was deprecated: https://twitter.com/curseforge/status/1522266862322692097?lang=en
There is a new api but from my understanding it is pretty different and
making the client work with it would be a non trivial changed.
@MelanX (creator of the service) said I should remove the service once
the api was shutdown, which was already before a few months.

* Remove curseforge from services list

Author: hlxid

README.md

@@ -22,7 +22,6 @@ nodecg-io is the successor of [ChatOverflow](https://github.com/codeoverflow-org
 - Android (using adb)
 - Art-Net
 - Atem
-- CurseForge
 - DBus
 - Discord
 - Discord RPC